Template:Rendering impact of reflections
From TOI-Pedia
Reflections (e.g. on a Blinn or a Phong) can have huge effect on the rendertime. When you do not need reflection for a certain object be sure to set it to 0. In real life the effect of reflections is a lot lower than set in the computer. 0.5 is almost like a mirror; e.g. for glass, 0.1 - 0.2 is much more applicable.
